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clang complains about the use of BoundedKeyCounter::const_pointer_iterator in vector::assign(), because it doesn't satisfy the ForwardIterator concept:

In file included from /home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:14:
/home/jenkins/workspace/ceph-master/src/common/bounded_key_counter.h:154:14: error: no matching member function for call to 'assign'
      sorted.assign(const_pointer_iterator{counters.cbegin()},
      ~~~~~~~^~~~~~
/home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:24:11: note: in instantiation of function template specialization 'BoundedKeyCounter<int, int>::get_highest<(lambda at /home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:24:30)>' requested here
  counter.get_highest(count, [&callbacks] (const Key& key, Count count) {
          ^
/home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:66:17: note: in instantiation of function template specialization '(anonymous namespace)::count_highest<int, int>' requested here
  EXPECT_EQ(0u, count_highest(counter, 10));
                ^
/usr/include/c++/v1/vector:588:10: note: candidate function not viable: no known conversion from 'BoundedKeyCounter<int, int>::const_pointer_iterator' to 'std::__1::vector<const std::__1::pair<const int, int> *, std::__1::allocator<const std::__1::pair<const int, int> *> >::size_type' (aka 'unsigned long') for 1st argument
    void assign(size_type __n, const_reference __u);
         ^
/usr/include/c++/v1/vector:576:9: note: candidate template ignored: requirement '!__is_forward_iterator<const_pointer_iterator>::value' was not satisfied [with _InputIterator = BoundedKeyCounter<int, int>::const_pointer_iterator]
        assign(_InputIterator __first, _InputIterator __last);
        ^
/usr/include/c++/v1/vector:586:9: note: candidate template ignored: requirement 'is_constructible<value_type, typename iterator_traits<const_pointer_iterator>::reference>::value' was not satisfied [with _ForwardIterator = BoundedKeyCounter<int, int>::const_pointer_iterator]
        assign(_ForwardIterator __first, _ForwardIterator __last);
        ^
/usr/include/c++/v1/vector:592:10: note: candidate function not viable: requires single argument '__il', but 2 arguments were provided
    void assign(initializer_list<value_type> __il)
         ^
In file included from /home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:14:
/home/jenkins/workspace/ceph-master/src/common/bounded_key_counter.h:154:14: error: no matching member function for call to 'assign'
      sorted.assign(const_pointer_iterator{counters.cbegin()},
      ~~~~~~~^~~~~~
/home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:36:11: note: in instantiation of function template specialization 'BoundedKeyCounter<int, int>::get_highest<(lambda at /home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:36:30)>' requested here
  counter.get_highest(count, [&results] (const Key& key, Count count) {
          ^
/home/jenkins/workspace/ceph-master/src/test/common/test_bounded_key_counter.cc:111:30: note: in instantiation of function template specialization '(anonymous namespace)::get_highest<int, int, std::__1::vector<std::__1::pair<int, int>, std::__1::allocator<std::__1::pair<int, int> > > >' requested here
  EXPECT_EQ(Vector({{1,1}}), get_highest(counter, 10));
                             ^
/usr/include/c++/v1/vector:588:10: note: candidate function not viable: no known conversion from 'BoundedKeyCounter<int, int>::const_pointer_iterator' to 'std::__1::vector<const std::__1::pair<const int, int> *, std::__1::allocator<const std::__1::pair<const int, int> *> >::size_type' (aka 'unsigned long') for 1st argument
    void assign(size_type __n, const_reference __u);
         ^
/usr/include/c++/v1/vector:576:9: note: candidate template ignored: requirement '!__is_forward_iterator<const_pointer_iterator>::value' was not satisfied [with _InputIterator = BoundedKeyCounter<int, int>::const_pointer_iterator]
        assign(_InputIterator __first, _InputIterator __last);
        ^
/usr/include/c++/v1/vector:586:9: note: candidate template ignored: requirement 'is_constructible<value_type, typename iterator_traits<const_pointer_iterator>::reference>::value' was not satisfied [with _ForwardIterator = BoundedKeyCounter<int, int>::const_pointer_iterator]
        assign(_ForwardIterator __first, _ForwardIterator __last);
        ^
/usr/include/c++/v1/vector:592:10: note: candidate function not viable: requires single argument '__il', but 2 arguments were provided
    void assign(initializer_list<value_type> __il)
         ^
2 errors generated.
gmake[2]: *** [src/test/common/CMakeFiles/unittest_bounded_key_counter.dir/build.make:63: src/test/common/CMakeFiles/unittest_bounded_key_counter.dir/test_bounded_key_counter.cc.o] Error 1